It has been generally accepted that the resistivity measurement at required high magnetic field and low temperature is a reliable method for accurately determining the critical magnetic field which is fundamentally important due to its close relation to the coherent length and the Cooper pairing strength [1]}. At the moment, the upper critical field \(H_{c2}\) (0) values of K\(_3\) C\(_{60}\)  were obtained either through the low-magnetic-field measurements of the magnetization [2]}, [3]} and resistivity [4]}, [5]}, [6]} or the high-magnetic-field non-contact measurements based on the \(ac\)  magnetization [7]}, [8]}, [9]} and radiofrequency technique [10]}, [11]}. Having accurate \(H_{c2}\) (0) of K\(_3\) C\(_{60}\)  through the resistivity measurements at high enough magnetic fields is still highly desired. Here we choose K-doped C\(_{60}\)  with the considerations of its similarity to other fullerides [12]}, [13]} and simplicity due to the absence of the antiferromagnetic state to solve this long-standing issue with the purpose to provide the constraints on the identification of the existing theoretical models or the future theory developments from a full set of superconducting parameters.
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